Self cleaning mixing drum



June 30, 193 1. J. 'EGGERT 1,812,823

SE LF CLEANING MIXING DRUM Filed July 5, 1929 31mm 1: JOSEPH EGGERT A L; (Tirol-neg 5 Patented June 30, 1931 UNITED STATES PATENT OFFICE JOSEPH EGGERT, OF COLUMBUS, OHIO,'ASSIGNOR TO THE JAEGER MACHINE COMPANY, OF COLUMBUS, 01-110, A CORPORATION OF OHIO SELF CLEANING MIXING DRUM Application filed July 5,

This invention relates to concrete mixing apparatus and particularly to those that are rotated on a horizontal axis on a motor driven transporting truck.

In mixing drums much trouble has been experienced due to the fact that when the remnant of the concrete mixture is left in the drum it dries and hardens, sticking tightly to the inner walls of the drum and interfering with the perfect and satisfactory operation of the apparatus. It is quite difficult and expensive to remove such dried and hardened concrete, especially when the accretion becomes thick due to continued neglect. The object of this invention is to prevent the accumulation of concrete upon said walls of the drum and provide means whereby the removal of such accumulations may be facilitated.

The invention is embodied in the example herein shown and described, the features of novelty being finally claimed.

In the accompanying drawings- Figure 1 is a fragmentary view in elevation and section of the discharge end of the drum according to the invention.

Fig. 2 is a cross section of the drum on the line IIII Fig. 1, looking to the left.

Fig. 3 is an elevation of the right hand end of the drum as seen in Fig. 1.

In the views 5 designates the drum which is mainly cylindrical and is mounted to turn on the horizontal axes, it being supported by suitable rollers such as shown at 6 on a motor truck bed 7. In practice the drum will preferably be operated by a power take-off from the truck driving motor and having means whereby the rotation of the drum may be reversed, such mechanism being well known and coming rapidly into more extensive use.

Within the drum is shown a pair of spiral blades 8 and 8 tied together in diametrically opposed relation to each other by strips 9 to form a stirring and moving element, the

parts of which cooperate to mix the concrete materials. The outside diameter of said mixing element is somewhat less than the internal diameter of the drum and is unattached thereto, hence when the drum is rotated the rims of the mixing element tend constantly 1929. Serial No. 376,109.

to rest on the lower portion of the wall of the drum.

The mixing element is driven in one direction by means of short lugs 10, 10, aflixed to the wall of the drum, said lugs adapted to i press against the margins of each of the blade members of the mixing element to cause said element to move with the drum, and this is true whether the drum is turned clockwise or anti-clockwise. It follows that when the motion of the drum is reversed from clockwise to anti-clockwise direction or conversely there is an interruption of the rotary motion of the mixing element until the lugs 10, 10,

move from one side of the blades to the opporotation of the mixing vessel is made upon a reversal of its motion before the lug contacts with the opposite side of the blade to move it with the vessel in the reverse direction.

The drum is thus kept clear of an accumulation of hardened concrete by operating the drum' in reverse directions at the close of each days use, water being supplied to wash out the drum while the drum is being turned.

The discharge opening of the drum is provided with a flange ring 11 around it. Extending axially through the drum is a stationary shaft 12 having its external rear end threaded as seen at 12 On said shaft is a cover 13 having a sleeve 14 terminating in a claw 15 that is engaged by a flange 16 on a hand wheel 17 threaded on the thread 12. By turning the hand wheel 17 in the proper direction the cover can be moved either to close or remove the cover 13 for permitting the discharge of the concrete mixture.

The forms of the parts can be changed without departing from the gist of the invention as claimed.

What I claim is:

1. A m1x1ng apparatus lncludmg a m1x1ng One of the blades thus acts to scrape vessel, a mixing member loosely contained in the vessel and resting on the lower wall of said vessel, and a lug on the wall of the vessel engaging the mixing member to rotate that member with the vessel.

2. A mixing apparatus including a rotatable vessel having a mixing member loosely contained therein and resting on the lower wall of the mixing vessel, and a lug on the Wall of the vessel to engage the mixing member to rotate the mixing member with the vessel when the latter is rotated in either direction.

3. A mixing apparatus including a rotatable vessel having a mixing member loosely contained therein. and resting on the'lower wall of the mixing vessel, and a lug on the wall of the vessel to engage the mixing memher to rotate the mixing member with the vessel when the latter is rotated in eitherdi rection, said mixing member adapted to scrape the wall of the vessel upon reversal of the motion of the vessel. i v

4. A mixing apparatus including a rotatable vessel having a mixing'member loosely contained therein and resting on the lower wall of the mixing vesseland a lug on the mixing vessel to engage the mixing member to rotate the. mixing member with the vessel when the latter is rotated in either di rection, there being an interval of rest of the mixing member when the direction of the vessel is reversed.

- 5. A mixing apparatus including a vessel supported to rotate on a horizontal axis and having therein a mixing member including a spiral mixing blade loosely supported-therein on the lower wall of the vessel; and a lug on the vessel to engage said mixing member 40 to rotate the mixing blade with the vessel. 6. A mixing apparatus including a vessel supported to rotate on a horizontal axis and having therein a mixing member including a pair of oppositely disposed spiral blades loosely supported therein on the lower wall of the vessel, and lugs in the vessel to engage said mixing member to rotate the. same with the vessel. V

7. A mixing apparatus including-a vessel supported to rotate on a horizontal axis and having therein a mixing member including a pair of oppositely disposed spiral blades tied together and loosely supported on the lower wall ofthe vessel, and lugs on the vessel to engage said mixingmember to rotate the same with the vessel. v

' JOSEPH EGGERT. 

